Since you're manually translating content, I'm assuming that you are, by definition, injecting your personal take on the content.
Now, if you're just using Google auto-translate, that's another story altogether.
But if you're manually translating, I don't see how this could be an issue since it's your native language, and you know English and are putting your own twist on the content you're translating.
At a certain level, it's original content you're creating.
The information may be the same, and it's basically reworded content, and in the eyes of copyright laws, it's derivative work, and you can still be liable for copyright infringement.
But that is not the case regarding the Google algorithm because it went through a human filter namely- you.
But if it's Google auto-translate, I suspect the content will get clobbered sooner rather than later.